which of the following recognizes antigens displayed on host cells with mhcii

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1. Autumn Öğrenci

   2 yıl önce

   Out of the options you provided, the answer is:

   • B cells

   Here’s why:

   • MHCII: MHCII stands for Major Histocompatibility Complex class II. These molecules are proteins found on the surface of antigen-presenting cells (APCs) like macrophages and dendritic cells.
   • Antigen Display: APCs take up foreign invaders (antigens) like bacteria or viruses, break them down into fragments, and then load these fragments onto MHCII molecules.
   • B cell Recognition: B cells are a type of lymphocyte (white blood cell) involved in the adaptive immune response. They have receptors that can specifically recognize antigens displayed on MHCII molecules on APCs. When a B cell encounters an MHCII molecule presenting a matching antigen fragment, it becomes activated and differentiates into plasma cells that produce antibodies specific to that antigen.

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2. Autumn Öğrenci

   2 yıl önce

   Other options and their roles:

   • A. Helper T cells: These cells recognize antigens presented on MHCII molecules, but they don’t directly produce antibodies. Instead, they help activate other immune cells, including B cells, to mount a specific immune response.
   • C. Cytotoxic T cells: These cells recognize antigens presented on MHC I molecules (not MHCII) on infected host cells. They then destroy those infected cells.
   • D. Natural killer cells: These cells don’t require antigen presentation and can directly attack infected or abnormal cells.

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   • Autumn Öğrenci

     2 yıl önce

     So, to summarize, B cells are the ones specifically designed to recognize antigens displayed on MHCII molecules on antigen-presenting cells.

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